Synthesis and Characterization of Efficient ZnO/g-C₃N₄ Nanocomposites Photocatalyst for Photocatalytic Degradation of Methylene Blue

• Main Authors: Renathung C. Ngullie, Saleh O. Alaswad, Kandasamy Bhuvaneswari, Paramasivam Shanmugam, Thangavelu Pazhanivel, Prabhakarn Arunachalam
• Format: Article
• Language: English
• Published: MDPI AG 2020-05-01
• Series: Coatings
• Subjects: ZnO; carbon nitride; ZnO/carbon nitride nanocomposites; hydrothermal; photocatalysts
• Online Access: https://www.mdpi.com/2079-6412/10/5/500

We examine the photocatalytic activity (PCA) of ZnO/graphitic carbon nitride g-C₃N₄ (g-CN) composite material for methylene blue (MB) degradation under visible-light irradiation (VLI). The polymeric g-CN materials were fabricated by the pyrolysis of urea and thiourea. More importantly, ZnO/g-CN nanostructured composites were fabricated by adding the different mounts (60, 65, 70, and 75 wt.%) of g-CN into ZnO via the simple hydrothermal process. Among fabricated composites, the 75% ZnO/g-CN nanocomposites displayed a superior PCA for MB degradation, which were ~three-fold an enhancement over the pure ZnO nanoparticles. The fabricated materials have been evaluated by X-ray diffraction (XRD), UV-Vis, Fourier transform infrared (FT-IR) spectroscopy, and electron microscopy. More importantly, the photodegradation of MB could get 98% in ZnO/g-CN could be credited to efficient separation of photo-induced charge carriers between ZnO and g-CN. Also, the recycling efficiency of the as-prepared composites was studied for multiple cycles, which shows that the photocatalysts are stable and suitable to carry out photocatalytic degradation in the logistic mode. Additionally, the probable photocatalytic mechanism has also discussed. The synthetic procedure of ZnO/g-CN based materials can be used in numerous fields such as environmental and in energy storage applications.